Android: file upload in background

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Hallo iam newbie with working android and php. iam using android to upload a files in background process. in android i using http method to upload a file to server. This code was work find but in logcat was appear a error code. Not error in Android code but error in result php code. Here the code in android side:
class AutoSendHandler implements Runnable
{
File[] files;
private final IActionListener helper;
private String urlString = "http://10.0.2.2/android/upload3.php";
public AutoSendHandler(File[] files, IActionListener helper)
{
this.files = files
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